How to offload routing from FWSM in routed mode to MSFC...

Unanswered Question
Jan 14th, 2010


I have 6509 switch with MSFC & FWSM card.

Configured single SVI instance VLAN 901 b/w 6509 & FWSM. Configured "int vlan2" & "Int vlan10" etc & FWSM is doing Inter VLAN routing.

I have seen there is an option to use MSFC for routing in this design but not sure how to offload to MSFC with existing configuration.

Can somebody advice on this?

And also, I am not sure whether my FWSM is behind MSFC or MSFC is behind FWSM & where STP topology ends. Appreciate if you can clarify.

This is the relevant configuration....

In the Chasis (MSFC)...

interface Vlan90
ip address
no ip redirects
no ip proxy-arp

In FWSM in the same chasis...

interface Vlan3
nameif INSIDE
security-level 100
ip address standby

interface Vlan90
nameif MGMT
security-level 100
ip address standby

Thanks in advance...



I have this problem too.
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Kureli Sankar Thu, 01/14/2010 - 12:02

Your topology is like this.


Both vlan 3 and 90 are of the same security level.

Do you get it?

Now if you want to send all traffic from the FWSM to the MSFC you would need a route on the FWSM as follows:

route MGMT

If you topology was like this:


Then we can say that the MSFC is behind the FWSM on the inside.



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